Jio is Telecom company and their parent already own Viacom18 broadcasting company have Colors Tamil, they will not buy soap opera serials airing channel. Again Nobody ready to sale market leader competitor.
800 crores is big bundle, nowadays anyone can copy serials and depends on how you Executive the serial. Even most of serials/movies have producers, they are not Joker sale content for lifetime and once content rights expire platforms removes contens. Coming to movies Vijay TV doesn't have huge/popular movie library like what Sun, Raj TV, Jaya TV, Kalaignar have Rajinikanth, Vijay, Ajith movies. iironically Vijay TV currently doesn't have not a single movie of Ajith.
Movie airing have big market in TN market, If media industry people interested on movie library, they will trying to Acquire or sign syndication deal with channels like Raj TV, Sun TV, Kalaignar, Jaya TV. not Vijay TV and Zee Tamil.